Bevel-gear-milling machine.



E. L; a

mm1 Gm; mmm@ Mmmm. APPLIGATIOH LED DEG. 5, 1905.

n n, 9 n .al L1 w q Q? y D ama @apn 8,

/Cf fst i' 3 SHEETS-SHEET 1.

whew A. Gamm au, maommscununens, msmmm x P. L. WESTON.

BBVEL GELB MILLING MACHINE.

Prummel nimm 1330.5, 1905.

` 6. Batented Sept28, 1909.

' AMW/rw 1.'L. WESTON. BEVBL GRAB MILLING KAGHIHE.

LPPLIGLTIOI FILED DBG. 5, 1905.

935,077, y n Patented sept 2s, 1909.

SHEETS-SHEET 3.

UNITED STATES PATENT GFTQE.

PERCY LEONARD WESTON, OF iNNANDALE, SYDNEY, NEW SOUTH WALES, AUSTRALIA.

BEVEL-GER-MILLING IWACHINE.

To all whom 'it may concern:

Be it known that I, PERCY LEONARD YVES- 'roN, a subject of the King of Great Britain and lreland, residing at Annandale, Sydney, in the State of New South lValeS, in the Commonwealth of Australia, electlical enO'ineer, have invented certain new and useful Improvements in Bevel- Gear- Milling Machines; and I do hereby declare that the following is a. full, clear, and exact description of the invention, which will enable others skilled in the ar-t to which it appertains to use the same.

This invention refers to improvements in machines for accurately cutting the teeth of bevel gears.

The object of the invention is to provide a machine by means of which either straight or helical teeth can be cut' on bevel gearing with an elongated rotary tool or cutter whose vaxis of revolution is 'in the direction` of the toot-h grooves, so that (first) the correct cone variation in the size of the teeth is secured and (second) accurate involute profiles are produced by a generating motion without the use of a templet or former.

The essential features of the invention are the use of an elongated rotary tool or cutter and means for so guiding it with its axis in the direction of the intertooth grooves that it describes an involute path. This guiding motion is geometrically that of a plane disk rolling on a fixed cone the latter of which bears a definite relation to the pitch cone of the bevel gear to be cut. The practical method of carrying this out is herein described as follows:- .Y

In the drawings :-Figure l is a side elevation of the machine. Fig. 2 is a longitudinal vertical section. Fig. 3 is a plan. Figs. 4t and 5 are opposite end views. are enlarged views of the cutter and mountings. Fig. S is a sectionl through line .a-Ly, Fig. il. y/

A is the bevel blank on which the teeth are to be cut. This blank is mounted on `a taper arbor B which fits into a hollow spindle B1 carrying a worm wheel .B2 which, vengages a worm B3 which in turn is operated y a handle B4. The revolution of/,the worm B3 is controlled by a division /plate B5 and y /l/ i g 4 B7 is a movable standard, whose position on the plate B8 is adjusted by means of the screw B9. The plate B@ isv adapted to be ...ruralim mixed abrjntithe @Eis 0f.

Specification of Letters Patent.

Application tiled December 5, 1905.

Figs. 6 and 7"' Patented Sept. 2S, 19053. Serial No. 290,467.

standard C by means of theworm gear B10, its position being indicated Yby the pointer B11 traveling over a graduated scale as shown.

B12 is clamping bolt to retain'thc pla-te BS in position. The head of this bolt t'rz'tVQlS in the curved groove B13.

C is a fixed standard on the top of which is a ball C1 whose center O is in line with the axis of' the arbor B and is hereinafter r'eferred to as the fixed apex.

C2 is a spherical socket which articulates with the ball C1 and forms joint as shown. a

C3 is an extension on the socket C2 provided for the purpose of supporting an arm CJl which is rigidly attached thereto. This arm carries a movable head .'I) and swivel plate D1 the latter bearing the cutter spindle head D2 and movable tail `stock D3 which is adjusted byfthe capstanheaded screw D4.

E is cutting tool which is shown in drawings as a spirally fluted/ milling cutter. This form ofk cutter is used for general milling purposes but for grinding or finishing work a plain abrasive tool may be used, the essential form of the cutter being that the contour of the tool should be a rustum of a cone, the apex of which ywould in producing the ordinary straight/'form of teeth be the point O as shown in the drawings, but for the production of helical teeth when the axis of the cutter is out of line with the fixed apex 0 the apex off the cutter will be determined by describing a circle about the fixed apex O te touch the cutter axis produced. The point off/.contact will be the apex of the cutter. The cutter E is provided with a taper shank .which fits into the spindle El which is revolved by the grooved pulley E2. The-other end of.' the cutter is free to revolve on a hardened center on the tail stock D3. In the drawings the position ot the cutter is shown forming an ordinary straight tooth. The adjustment of the cutter axis to form helical teeth is performed by means of the swivel plate D1, which is adapted to be clamped in any position byfmeans of the set screws D5. A graduated scale as shown in Fig.l 6 is provided to facilitate the adjustment of the swivel. plate D1. On thefree end'of the arm C4 is fixed a 'sectorplate F. The working face F1 of this plate is a portion of the plane containing the cutter axis and the fixed apex O, and is parallel to the planel of the swivel plate Dl which carries the cutter. In other a ball and sdcl'et.

i so

where (a) is the semi-angle of the guide 'Assu ming that 'cured to the lower extremity words the working face of the plate may be described as an annular portion of a sector of a disk whose center is the xed apex O and in the plane of whiclrlies the entier axis. The plate l? is fixed to the arn. C* by li web as shown. The working face F1 engages a guide cone G fixed to a supporting standard Gf', the engaging face G1 of which is in the forni of a portion of a frustuni of va cone whose apex is at the point O. rlhe relation of the angle of the face of this guide cone to the angle of the pitch cone of the work is determined by the following formulanfine (if) sine (b) cosine (c) cone. (Z2) is the seini-angle of the pitch cone ofthe work. is theangle at which the pitch cone of the worl; is intersected by the involute profile 1of the tooth of the Work. rlhat is to say that the value of determines the Obliquity of action of the teeth on the work.

A guide cone of particular angle can without. serious error be used for work within a certain range on either side of the corresponding correct pitch angle of the work. the ordinary range of semipitch angles of the work is from 15 degrees .to degrees and the angle of obliquityl degrees it is' found that aset of six guide cones would be suiiiient to produce this range of work. Provision is made as shown in the drawings for readily detaching the uide cone from its supporting standard.

The faces F1 and G1 are provided with corresponding grooves to receive a pair of flexible steel bands H and H1. The depth of these grooves will be about one half the thickness of the bands. The top`end of the band l-l is secured by means of a'\screw to the upper extremity of the guide"`cone G while the lower extremity is similarly se of the sector plate I". The top end of the band H1 is\\at tached to the top end of the sector plate-Fv while its lower end is attached-to the lower end of the guide cone G.

J is a traveling clutch which grips and maintains the sector plate F in contact with the guide cone G. This clutch is provided with a friction roller J1 which bears on the inner surface G2 of the cone G and a pressure plate J '2 which bears on the outer face F2 of the sector plate F, see Fig. S. The pressure exerted by the plate J 2 is regulated by set screws J 3. The clutch J is attached to the ends of a pair of circularly curved arms K and K1. Ilfhe form of the arms K and K1 is that of arcs of circles described about the apex O. These arms tit into corresponding grooves in the spur wheel L which is adapted to partially revolve about a horizontal spindle M. This partial revolution causes the clutch J to travel in a circular path, the roller J1 ruiming on the inner surface GL of the cone G and the plate J 2 sliding on the outer surface F2A of the plate l? which results in the sector plate F rolling on the guide cone G and thus causing tlnx cutter lil, while. operating, to describe Va geometric-ally correct involute conical surface which is the required profile of the teeth. The spur wheel L meshes with a pinion N which is driven by a worm wheel P gearing with a. worin P1 which in turn is driven by a` pulley P2.

l is a nut which acts as a clutch for the worin wheel l? when screwed up, and when slaelrened allows it to run free so that by revolving the handle P5 the spur gear L can be rotated by the pinion N without the intermediate worin gear. The belt engaging the pulley l is controlled by ashifting guide Q which is held. in the operating position against the pressure of a coil spring Q1 by means of a trigger Q2 which is in the form of a rocking lever one arm of which retains the roller Q3.

R is an adjustable cam secured to the spur wheel L in such a manner that when the latter is in any predetermined position the cam will engage the roller Q3 and .release the trigger Q2 thus allowing the guide Q to throw the belt on to a loose pull The method of operating the machine is as follows 2-The most su table guide cone in relation to the work being attached and the bands H and H1 secured in position, the clutch J is then placed in engagement with the sector plate'F and guide cone G either at the top or bottom of its path. The work A which has preferably had the grooves previously roughly gashed out in any well known way is then mounted on the arbor B. Should the angle of the guide cone exactly correspond, according to the formula hereinbefore given, with the pitch cone of the work then the plate B8 which carries the work will ey P3.

be in the central position as shown in the drawings; but should the pitch cone of the work be of a sl htly different semi-cone angle then it will e necessary to adjust the di eren'ce'by moving the plate B8. This adjustment j is facilitated by the graduated scale and' pointerfBu. f The next adjustment necessary is to bring the work so that its apex corresponds with point O; this is effected by the screw B,the correct position being indicated by the raduated scale and pointer'B'-AA suitab cutter E is now mounted inthe cutter. head` Dand the position of. the latter is adjustedl relative to the work and clamped onthe arm-C*- by the set screws. 'The cutter is now set in motion by means of a belt from any overhead countershaft. The feed motion is then started by setting the trigger Q2.A The action of the WQrm and SDur gearing.;nfiheiaaamnim.. A

shifting guide Q while the other carries af' CTX CII

pinion c N.

ism results in a very sion7 motion ot the spur Wheel L, and the carrying ot the clutch J, from the beginning of its path at one end of the sector plate F and guide cone G, toward its central horizontal position. `When the clutch J has completed its predetermined path required by the depth of the iinished groove in the ivorlr, the cam R comes in contact With the roller Q3 and releases the trigger Q2 thus throwing the feed mechanism out ot' gear. This operation completes the protile of one side ot' the iirst tooth. The cutting tool is novv returned to its original position clear of the Werl; by first slaclreningl the loci; nut P* and then revolving the handle P5 in the reverse direction. The Work is now revolved through an angle corresponding to the pitch of one tooth by means oit the handle B* and worm gear B2 and Bi", the nut P tightened, and the operation as before described repeated, and so on until all the teeth have been out on one side. To complete the reverse profiles of the teeth the clutch J is started from the opposite end of the sector plate F and guide cone G, the cam R being adjusted to correspond.

The pinion N is fixed on a stub shaft having at its outer1 end a handle P5 and a collar l between the handle P5 and the Loosely mounted on the stub shaft N and the outer side of the collar il is a Worm Wheel P and screwed on the stub shaft N on the outer side of the Worm Wheel P is the nut Pt. By slaclening the nut P* on the stub shaft N', the latter can be turned in either direction Without causing the revolution of the Worm Wheel P, and by tightening the nut P* against the Worm Wheel P the Worm Wheel and shaft can be caused to revolve unitedly so that the motion transmitted from the Worm P to the Worm Wheel P will be communicated to the stub shaft N and pinion N, and by the latter to the spur Wheel L. During` the revolution of the Worm 1) motion is transmitted by it to the Worm Wheel l), stub shaft N and pinion N and by the pinion N to the spur Wheel L to cause the operation ot' the co-acting parts. Then the parts have performed their functions, the revolution ot` the Worm 1) is discontinued and the nut Pf* can then be slackened to permit ot the stub shaft N beingturned by the handle 13 in the reverse direction to restore the parts co-acting with the spur Wheel L to their normal or initial position Without the necessity of causing the reverse revolution of the Worm 1) and the motion transmitting` means.

Having thus fully described my invention what l claim nevf and desire to secure by Letters Patent is;

l. It bevel `gear milling machine comprisingl a stationary standard having a head Whose center constitutes a fixed axis t'or the co-acting` parts, a. sleeve having a socket articulatinff'ly mounted on the head ot the stationary f-ztandard, an arm supported by the sleeve, a tool supporting means connected ivith the arm, a Work-supporting standard adjustable longitudinally to the stationary standard and radially on an arc concentric with the lined center, means for actuating the arm to guide the tool with respect to the vrorl, and means for producing` the required geometrically correctsurface,l comprising a sector plate on the tree end ot the arm, and a guide cone engaging the sector plate.

bevel t(rear milling` machine comprisingl a tool supporting arm, means 'i'oriiai'ticnlatingly holding one end ot the tool. suijrperting arm, a sector plate connected with the other end ot the tool supportingv arm, a guide cone engag'inj, with the working' iace ol the. sector plate, and a travelingl clutch maintaining the sector plate in contact with the guide cone.

2l.' A bevel gear milling machine comprising' a tool supporting` arm, means tor articulatinw'lv holding one end ot the tool supporting a sector plate connected with the other end ot the tool supporting arm, a guide cone engaging with the working face ot the sector plate, a pair ot tiexible bands secured to the sector plate and to the guide cone, and a traveling clutch maintaininggthe sector plate in contact with the Lguide cone.

et. A. bevel gear milling machine comprising a fixed standard1 a tool supportingarm, a tool holder adjustable on the tool supportin arm, means articulatingly connecting` one end ot the tool supporting arm with the xed standard, a sector plate connected with the other end ot the tool supportinr;r arm, a guide cone engaged with the Workingr tace ot the sector plate and a traveling clutch maintaining` the sector plate in Contact with the guide cone.

5. it bevel gear milling` machine comprising a tired standard, a tool suliportinp arm, a tool holder adjustable on the tool supporting arm, means articulatingly connecting' one end o'j the tool supportiim` arm Vith the fixed standard, a sector plate connected ,vith the other end or the tool supportingY arm, a `guide cone engaged with the .vorliinn face ot' the sector plate, a pair ot tieXible bands secured to the sector plate and to the guide cone, and a traveling: clutch maintainiim` the sector plate in contact with the guide cone.

G. it bevel gear milling` machine comprising a base, a stationary standard supported thereon having` a head, the center ot' which constitutes a fixed center for the co-acting` parts, an oscillatory plate mounted upon the base and movable in a curvilinear plane concentric with the fixed center, a work-supporting stantiard carried by the oscillatory plate, means for adjusting` the oscillatory plate, means for adjusting the Work supporting standard relatively to the stationary standard, an arm supported by the stationary standard, a tool supporting means adjustably connected with the arm and arranged so that the longitudinal axis of the workcutting tool will constantly intersect the fixed center, and means for automatically positioning the arm to guide the tool with respect to the work, comprising a sector plate on the free end of the arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and the guide cone, and moans for actu- 7. A bevel gear milling machine comprising a base, a stationary standard support-ed thereon having a head, the center of which constitutes a fixed center for the co-acting parts, an oscillatory plate mounted upon the base and movable in a curvilinear plane concentric with the fixed center, a work-supporting standard carried by the oscillatory plate, means for adjusting the work-supporting standard relatively to the stationary standard, an arm supported by the stationary standard, a tool supporting means adjustably connected with the arm and arranged so that the longitudinal axis of the work cutting too-l will constantly intersect the fixed center, and means for automatically positioning the arm to guide the tool with respect to the work, comprising a sector plate on the free end of the arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and the guide cone, and means for actuating the traveling clutch, comprising a pair of clutch arms, a spur wheel to oscillate the clutch arms in a xed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a worm wheel mounted on the stub shaft and arranged to revolve unitedly with it in one direction and to permit the stub shaft to revolve independ- `ently of it in the opposite direction, a worm meshing' with the worm wheel, and means for causing the revolution of the worm.

S. A bevel gear milling machine comprising a base, a stationary standard supported thereon having a head, the center of which constitutes a fixed center for the co-acting parts, an oscillatory plate mounted upon the base and movable in a curvilinear plane concentric with the fixed center, a work supporting standard carried by the oscillatory plate, means for adjusting the work-supporting standard relatively to the stationary standard, an arm supported by the stationary standard, a tool supporting means adjustably connected .with the arm and arranged so that the longitudinal axis of the work-cutting tool will constantly intersect the fixed center, means for automatically positioning the arm to guide the tool with respect to the work, comprising a sector plate on the free end of the arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and the guide cone, and means for actuating the traveling clutch, comprising a pair of clutch arms, a spur wheel to oscillate the clutch arms in a iixed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a worm wheel mounted on the stub shaft and arranged to revolve unitedly with it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a worm meshing with the worm wheel, means for causing the revolution of the worm, and means for automatically stopping the motion of the worm vwhen the traveling clutch has completed its movement in a forward direction.

9. A bevel gear milling machine comprising a base, a stationary standard supported thereon having a head, the center of which constitutes a fixed center for the co-acting parts, an oscillatory plate mounted upon the base and movable in a curvilinear plane concentric with the fixed center, a work supporting standard carried by the oscillatory plate, means for adjusting the work supporting standard relatively to theV stationary standard, an arm supported by the stationary standard, a tool supporting means adjustably connected with the arm and arranged so that the longitudinal axis of the work cutting tool .will constantly intersect the fixed center, means for automatically positioning the arm to guide the tool with respect to the worlr, comprising a sector plate on the free end of the arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and the guide cone, and means for actuating the traveling clutch, comprising a pair of clutch arms, a spur wheel actuating the clutch arms and adapted to oscillate the clutch arms in a fixed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a worm wheel mounted on the stub shaft and arranged to revolve unitedly .with it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a worm meshing with the worm wheel, means for causing the revolution of the worm, and two bands, the ends of one of which are connected to the upper extremity of the guide cone and to the lower extremity of the sector plate, and the other to the upper extremity of the sector plate and to the lower extremity of the guide cone.

lO. A bevel gear milling machine comprising a tool supporting arm, means for articulatingly holding one end of the tool supporting arm, a sector plate connected with the other end of the tool supporting arm and having its working face grooved a guide cone having its working face grooved and engaging with the working face of the CIT geen?? 'sector plate, a pair of flexible bands, one flexible band being secured to the upper extremity of the guide cone and the lower extremity of the sector plate, and the other flexible band being secured to theloiver extremity of the guide cone and the upper extremity of the sector plate, and a traveling clutch maintaining the sector plate in contact with the guide cone, a pair of arms to the end of which the clutch is attached, a spur ivheel having a grooved hub arranged to receive said arms, and means for causing the revolution of the spur Wheel.

ll. A bevel gear milling machine comprising a stationary standard having a head whose center constitutes a fixed center for the co-acting parts, a Work supporting standard adjustable relatively to the stationary standard and radially on an arc concentric with the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable .head adjustable on the arm relatively to the Work holding standard, a. plate sWiveled to the movable head, a tool supporting means connected with the swivel plate, a sector plate on the free end of the articulating arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, and means for actuating the traveling clutch.

l2. A bevel gear milling machine comprising a stationary standard having a head Whose center constitutes a fixed center for the co-acting parts, a worlrsupporting standard adjustable relatively to the stationary standard and radially on an arc concentric With the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the Work holding standard,

a plate swiveled to the movable head, a tool supporting means connected Wit-h the swivel plate, means for actuating the arm and causing the tool carried by the tool supporting means to produce a geometrically correct surface, comprising a sector plate on the free end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, and means for actuating the traveling clutch.

13. A bevel gear milling machine comprising a stationary standard having a head Whose center constitutes a xed center for the co-acting parts, an oscillatory plate movable in a curvilinear plane concentric with the fixed center, a Worlr supporting standard carried by the oscillatory plate and adjustable thereon relatively to the stationary standard, an arm articulatingly supported from the head of the stationary standard a movable head adjustable on the arm relatively to the Work holding standard, a plate swiveled to the movable head, a tool supporting means connected with the swivel plate, means for actuating the arm and causing the tool carried by the tool supporting means to produce a geometrically correct surface, comprising a sector plate on the free end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, and means for actuating the traveling clutch.

ll. A bevel gear milling machine comprising a stationary standard having a head whose center constitutes a fixed center for the co-acting parts, a Work supporting standard adjustable relatively to the stationary standard and radially on an arc concentric with the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the Work holding standard, a plate swiveled to the movable head, a tool supporting means connected With the swivel plate, a sector plate on the free end of the" articulatmg arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, means :tor actuating the traveling clutch, comprising a pair of clutch arms, a spur Wheel to oscllate the clutch arms in a fixed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a Worm Wheel mounted 011 the. stub shaft and arranged to revolve unitedly with it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a Worm meshing with the worm -Wheel, and means for causing the revolution of the Worm.

l l5. A bevel gear milling machine comprising a stationary standard having a head Whose center constitutes a fixed center for the co-acting parts, -a Work supporting standard adjustable relatively to the stationary standard and radially on an arc concentric with the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the Work holding standard, a plate svviveled to the movable head, a tool supporting means connected with the swivel plate, means for actuating the arm and causing the tool carried by the tool supporting means to produce a geometrically correct surface, comprising a sector plate on the free end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector "plate and guide cone, means for actu ating the traveling clutch, comprising a pair ofvclutch arms, a spur Wheel to oscillate the clutch arms in a fixed path, a pinion meshing with the spur Wheel, a stub shaft for the pinion, a Worm Wheel mounted on the st ub shaft and arranged to revolve unitedly With it in one direction andto permit the stub shaft to revolve independently of it in the opposite direction, ay Worm meshing with the ivorm Wheel, and means for causing the revolution of the Worm.

16. A bevel gear milling inacliiiie.\com prising a stationary standard having a head Whose center constitutes a Fixed center tor the co-acting parts. an oscillatory plate movable in a .urvilinear plane concentric With the liXed center, a Work supporting standard carried by the oscillatory plate and adjustable thereon relatively to the stationary standard, an arm articulatingly supported from the head of the stationary standard, a

vmovable head adjustable on the arm relatively to the work holding standard, a plate swiveled to the movable head, a tool supporting means connected with the swivel plate, means tor actuating the arm and causing the tool carried by the tool supporting means to produce a gcomet-rically correctsurface, comprising a sector plate on the free end of the articulating a'rm, a guide cone engaging the Working tace of the sector plate, a traveling clutch engaging the sect-or plate and guide cone, means for actuating the traveling clutch, comprising a pair of clutclg arms, a 'spur-.Wheel to oscillate the clutch arms in a Fixed path, a pinion meshing with the spur Wheel, a stub shaft for the pinion, a Worm Wheel mounted on the stub shaft andharrangcd to revolve unitedly With it in one direction and to permitthe stub shaft to revolve independently of it in the opposite direction, a Worm meshing With the Worm wheel, and means for causing t-he revolution of the Worm. ,Y

17. A bevel gear milling machine comprising a stationary standard having a head Whose center constitutes a fixed center for the co-acting parts, a Work supporting standard adjustable relatively to the stationary standard and radially on an arc concentric with. the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the Work holding standard, a plate swiveled to the movable head, a tool supporting means connected with the swivel plate, a sector plate on the :tree end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, means for actuating the traveling clutch, comprising a pair of clutch arms, a spur Wheel to oscillate the clutch arms in a fixed path, a pinion meshing with the spur Wheel, a stub shaft for the pinion, a Worm Wheel mounted on the stub shaft and arranged to revolve unitedly' With it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a Worm meshing with the Worm Wheel, means for causing the revolution of the Worm, and means for stoppingv the' motion of the ivorm when the traveling clutch has' completed its movement in the foi-Ward direction.

18. A bevel gear milling machine com prising a stationary standard having a head ivhose center constitutes a fixed center for the co-acting parts, a Work supporting stand ard adjustable relatively to the stationary standard and radially on an arc concentric With the fixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the Work holding standard, a plate siviveled to the movable head, a tool supporting means connected with the swivel plate, means for actuating the arm and caus ing the tool carried by the tool supporting means to produce a geometrically correct surface, comprising a sec-tor plate on the free end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate andV guide cone, means for actuating the traveling clutch, comprising a pair of clutch arms, a spur Wheel to vOscillate the clutch arms in a fixed path, a pinion meshing With the spur Wheel a stub shaft for the pinion, a Worm mounted on the stub shaft and arranged to revolve unitedly with it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a Worm meshing with tlie Worm Wheel, means for causing the revolution of the Worm, and means for stopping the motion of the Worm When the traveling clutch has completed its movement in the forward direction.

19. A bevel gear milling machine comprising al stationary standard having a head Whose 'center-constitutes a xed center for the co-acting parts, an oscillatory plate movable in a curvilinear plane concentric with the fixed center, a Work supporting standard carried by the oscillatory plate and adjustable thereon relatively to the stationary standard, an arm articulatingly supported from the head of the stationary standard a movable head adjustable on the arm relatively to the Work holding standard, a plate swiveled to the movable head, a tool sup` porting means connected With the swivel plate, means for actuating the arm and causing the tool carried by the tool supporting means to produce a geometrically correct surface, comprising a sector plate on the free end of the articulating arm, a guide cone engaging the Working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, means for actuating the traveling clutch, comprising a pair of clutch arms, a spur Wheel to oscillate the clutch arms in a fixed path, a pinion meshing With the spur Wheel, a stub shaft for the pinion, a Worm Wheel mounted on the stub shaft and arranged to vrevolve unitedly With z s, r'. HIV. i Y it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a worm meshingl with the worm wheel, means t'or causing th revo` lution of the worin, and means tor stopping t-he motion of the worm when the traveling clutch has completed its movement in the forward direction.

20. A bevel gear milling machine comprising a stationary standard having a head whose center constitutes a iXed center for the co-acting parts, a work supporting standard adjustable relatively to the stationary standard and radially on an arc concentric with the iixed center, an arm articulatingly supported from the head of the stationary standard, a movable head adjustable on the arm relatively to the work holding standard, a plate swiveled to the movable head, a tool supporting means connected with the swivel pla-te, a .sector plate on the free end of the articulating arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, means tor actuating the traveling Y clutch, comprising a pair of clutch arms, a

spur wheel to oscillate the clutch arms in a xed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a worm wheel mounted on the stub shaft and arranged to revolve unitedly with it. in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a worm meshing with the worm wheel, means for causing the revolution of the worm, means for stopping the motion of the worm when the traveling clutch has completed its movement in the forward direction, and two bands the ends of one of which are connected to the upper extremity of the guide cone and the lower extremity of the sector plate, and the other to the upper extremity of the sector plate, and to the lower extremity of the guide cone.

21. A bevel gear milling machine comprising a stationary standard having a head whose center constitutes a fixed center for the co-acting parts, a'n oscillatory plate mounted on the base and movable in a curvilinear plane concentric with the lixed center, a work support-ing standard carried by the oscillatory plate and adjustable thereon relatively to the stationary standard, an arm articulatingly supported from the head of the stationary standard a movable head adjustable on the arm Irelatively to the work hold ing standard, a plate swiveled to the movable head, a tool supporting means connected with the swivel plate, means for actuating the arm and causing the tool carried by the toolsupporting means to produce a geometrically correct surface, comprising a sector plate on the free end of the articulating arm, a guide cone engaging the working face of the sector plate, a traveling clutch engaging the sector plate and guide cone, means for actuating the traveling clutch, comprising a pair of clutch arms, a spur wheel to oscillate the clutch arms in a iXed path, a pinion meshing with the spur wheel, a stub shaft for the pinion, a worm wheel mounted on the stub shaft and arranged to revolve unitedly with it in one direction and to permit the stub shaft to revolve independently of it in the opposite direction, a worm meshing with the worm wheel, means for causing the revolution of the worm, means for stopping the motion of the worm when the traveling clutch has completed its movement in the forward direction, and two bands the ends of one of which are connected to the upper extremity of the guide cone and the lower extremity of the sector plate, and the other to the upper extremity of the sector late, and to the lower eXtremty of the guide cone.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

PERCY LEONARD W'ESTON.

'Vitnesses T. C. ALLEN, WALTER SIGMONT, 

